Stone breaker



June 9, 1959 H. H. METZGAR 2,889,823

STONE BREAKER Filed Jan. 11. 1956 l 1N VENTOR HH-Mzya k? BY ATTORNEYS June 9, 1959 H. H. METZGAR 2,889,823

' STONE BREAKER Filed Jan. ll, 1956 2 Sheets-Sheet 2 STGNE BREAKER Harry H. Metzgar, Camdenton, Mo.; William Rickard,

executor of the estate of said Metzgar, deceased, assignor to William A. Rickard and Florence Rickard, both of Camdenton, Mo.

Application January 1'1, 1956, Serial No. 558,573

2 Claims. (Cl. 12S-23) The present invention relates to stone breakers, and more particularly, to hydraulically actuated mechanisms for breaking building stone.

The primary object of the invention is to provide a hydraulically actuated set of breaking teeth movably related to a stationary set of opposed breaking teeth for breaking stone placed therebetween.

Another object of the invention is to provide a stone breaking device in which the stone is supported during the breaking operation.

A further object of the invention is to provide a stone breaking device of the class described above having individually adjustable and replaceable breaking teeth in both the moving and the stationary set.

A still further object of the invention is to provide a hydraulically actuated stone breaking mechanism of the class described above which is mounted on a hand truck so as to render the mechanism completely portable.

Another object of the invention is to provide a stone breaking mechanism of the class described above which lwill be inexpensive to manufacture, positive in action, and simple to use.

Other objects and advantages will become apparent in the following specification when considered in the light of the attached drawings, in which:

Figure 1 is a longitudinal cross-section of the stone breaker taken along the line 1-1 of Figure 2 and the line 1-1 of Figure 3, looking in the direction of the arrows in both instances.

Figure 2 is a horizontal cross-section taken along the line 2 2 of Figure 1, looking in the direction of the arrows.

Figure 3 is a transverse cross-section taken along the line 3-3 of Figure 1, looking in the direction of the arrows.

Figure 4 is an enlarged fragmentary horizontal crosssection taken along the line 4-4 of Figure 3, looking in the direction of the arrows.

Figure 5 is an enlarged fragmentary vertical crosssection taken along the line 5--5 of Figure 1, looking in the ydirection of the arrows.

Figure 6 is an enlarged fragmentary horizontal crosssection taken along the line 6--6 of Figure 3, looking in the direction of the arrows.

Figure 7 is an enlarged fragmentary longitudinal crosssection taken along the line 7-7 of Figure 3, looking in the direction of the arrows.

Referring now to the drawings in detail wherein like reference numerals indicate like parts throughout the several figures, the reference numeral 10 indicates generally a hand truck upon which the invention is mounted. The hand truck 10 comprises a U-shaped tubular frame member 11 having a handle portion 12 at one end thereof, and a plate 13 secured to the opposite ends of the U- shaped frame 11 and extending right angularly thereto. A cross member 14 is welded to the frame 11 adjacent the handle 12.

A pair of legs 15 and 16 are secured to the frame 11 arent adjacent the cross plate 14 and extend downwardly therefrom to support the frame 11. A cross brace 17 extends between the sides of the frame 11 at a point substantially midway between the cross plate 14 and plate 13. A longitudinal brace 18 extends from the cross plate 14 to the cross brace 17.

A pair of wheels 19 and 20 are mounted to an axle 21 at the opposite ends thereof by any suitable means (not shown), and a pair of opposed brackets 22 and 23 support the axle 21 in spaced apart relation below the frame 11. The brackets 22 and 23 being secured to the frame 11 by any suitable means -such as welding or the like. A support plate 24 extends across the frame 11 adjacent the plate 13 and is secured thereto by welding or the like.

The structure described above of the hand truck 10 is of a conventional nature and forms the portable support for the invention.

A stone breaker, generally indicated at 25, consists of a pair of upright frame members 26 and 27 which extend in substantial parallel relation to each other and are spaced apart at their upper ends lby means of a header 28 which is welded to the uprights 26 and 27 at the upper portions thereof. The lower ends of the uprights 26 and 27 are secured together by means of a forward plate 29 and a rear plate 30 which are positioned on the front and rear sides, respectively, of the uprights 26 and 27 and welded thereto to form with the uprights 26 and 27 and the header 28 a rectangular frame work. The plates 29 and 30 are spaced apart a distance equal to the thickness of the uprights 26 and 27. v

rPhe lower edge 31 of the header 28 is provided with a plurality of spaced apart bores 32 extending perpendiculariy therein. A plurality of wedge-shaped teeth 33 having a cutting edge 34 formed on the lower edge thereof yare provided `with cylindrical Shanks 34' each positioned within one of the bores 32 and secured therein by means of set screws 35.

In Figure 7 is illustrated a shim 36 which can engage over the Shanks' 34' and seat against the bottom edge 31 of the header 28 to align the cutting edges 34 of the teeth 33. A cutting bar 37 is positioned between the uprights 26 and 27 for reciprocation therebetween and is provided with a pair of guide plates 38 and 39 on the front side thereof which extend over the uprights 26 and 27 as illustrated in Figure 6. A pair of generally triangular braces 40 and 41 are secured to the rear face of the cutter bar 37 and likewise extend beyond the uprights 26 and 27 to cooperate with the guides 38 and 39 to maintain the cutter bar 37 in l'aligned position between the uprights 26 and 27 A pair of guide blocks 42 and 43 are positioned below the cutter bar 37 and between the guide plates 38 and 39 and braces 40 and 41, respectively. A pair of bolts 44 and 4S extend through the guide plates 38 and 39, cutter bar 37, and braces 40 and 41, respectively, and additional bolts 46 and 47 secure the lower portions of the guides 38 and 39 and braces 40 and 41 together. A pair of triangular braces 48 and 49 are secured to the braces 40 and 41 and extend rearwardly therefrom in parallel spaced apart position. The cutter bar 37 has a plurality of cylindrical bores 50 extending perpendicularly into the upper edge 51 thereof.

A generally rectangular table 52 is horizontally posi tioned on the upper edges of the rearwardly extending members 48 and 49, the upper edges of the braces 40 and 41, and the upper edge 51 of the cutter bar 37. A forward end 53 of the table 52 is oiset to engage over the cutter bar 37 A plurality of wedge-shaped teeth 54 have their shanks 54' positioned in the bores 50 and secured therein by set screws 50'. The teeth 54 extend upwardly to a point above the top of the table 52.

AThe teeth S4 have the upper exposed edges thereof sharpened as at 55. The teeth 54 are in exact vertical alignment with the teeth 33 so that the sharpened edges 34 and 55, respectively, thereof are 4aligned with each other.

A pair of clarnp plates 56 extend between the plates 29 and 30 engaging over the top edges thereof as illustrated in `Figure l. A pair of bolts 57 extend downwardly through-the clamping plates 56 and the cross plate 24. Nuts 58 on the bolts 57 secure the plates 29 and 30 to the cross plate 24 so as to anchor the stone breaker 25 to the hand truck 10.

A-hydraulic ram 59 is positioned between the plates 29 and 3l) and is provided with Yan adaptor 60 threaded to the lower end thereof through which the clamping bolt 6-1 extends to clamp the ram 59 to the plates 29 and 30. A piston 62 within the ram 59 is provided with a piston rod 63 extending vertically therefrom. A U-shaped clamp 64 is secured to the'upper en d of the piston rod 63 and engages over the eutterbar'l to which it is secured by means of a bolt 65.

A pair of springs 66 are positioned on opposite sides o f the breaker having their lower ends secured to eyes 67 in the plate 30 and to eyes 68 in opposite sides of the table 52. The springs 66acting to return the table 52 to its lowermost position when the ram 59 is deactivated.

A hydraulic pump 69 is carried by a reservoir 70 mounted on the cross plate 14. The pump 69 is actuated by a handle 71 extending upwardly therefrom `and the return flow of fluid from the ram 59 -to the reservoir 70 is controlled by a valve 72 operated by a handle 73. A flexible conduit 74 connects the pump 69 to the hydraulic ram 59 and is provided with detachable couplings 75.

In the use and operation of the invention, building stone is placed on the table 52 extending between the uprights 26 and 27 with the line indicating the cut aligned with the cutting edges 34 and 55 of the teeth 33 and 54. The valve 72 is closed land the handle 71 is actuated, pumping fluid from the pump 69 through conduit 74 to the ram 59 moving the-table 52 and the stone to be cut upwards until the upper face of the stone is in engagement with the teeth 32. Further movement of the table 52 will force the cutting edges 34 and 55 into the stone causing the stone to break on a line extending therebetween. The valve 72 is then opened permitting the springs 66 to return thetable 52 to its lowermost position thus completing the cutting cycle.

The structure described yabove will afford a rapid accurate stone breaking mechanism which will save considerable time in the laying of structural stone since the breaking operation can be considerably speeded. The teeth 33 and 54 are maintained in sharp condition, and the adjacent teeth are .maintained in exact alignment to simplify the breaking operation. Obviously, as the teeth become worn due to sharpening, spacing shims 36 are employed to maintain the alignment of the cutting edges of the teeth.

Having thus described the preferred embodiment of the invention, it should be understood that numerous modiications and structural adaptations may be resorted to without departing from the scope of the appended claims.

What is claimed is:

1. A stone breaker comprising a generally U-shaped frame having a pair of spaced parallel upright members and a header extending between the upper end portions of said upright members,A said header extending perpendicularly to said upright members, cutting means detachably secured to the lower edge of said header and depending therefrom, said upright members having their adjacent faces parallel, a cutter bar arranged in parallel relation to said header between said upright members, a pair of guide plates secured to opposite sides of each end of said cutter bar with the pair of plates at each end respectively engaging on opposite sides of one of said upright members, a guide block positioned beneath each end of said cutter bar in engagement therewith and engaging the adiacent faces of said upright members, means securing said guide blocks to said guide plates and said cutter bar, said cutter bar being guided by said upright members through said guide plates and said guide blocks for vertical reciprocating movement along vsaid upright members, cutter means detachablysecured to the upper edge of said cutter bar for cooperation with said cutting means, means adjacent said cutter bar and movable therewith for supporting work to be cut, means mounted below said cutterV bar and secured thereto for moving said cutter bar-toward said header, and means extending between said cutter bar and said U-shaped frame for moving said cutter bar away from saidheader.

2. A mobile stone breaker comprising a hand truck, a generally U-shaped frame, clamp means detachably sccuring said frame to said truck, said frame having a pair of spaced parallel upright members and a header extending between the upper end portions of said upright members, said header extending perpendicularly to said upright members, a plurality of- Wedge shaped teeth detachably secured in spaced relation along thelower edge of said header and depending therefrom, the cutting edges of said teeth beingalignedin va straight'line with respect to each other, Asaid upright members having their adjacent faces parallel, a cutter bar arranged in parallel relation to said header vand `slidingly engaged between said upright members, a pair of guide plates secured to opposite sides of each end of said cutter bar with the pair of plates at each end respectively engaging on opposite sides of one of said upright members, a guide block positioned beneath each end of said cutter bar in engagement therewith and engaging the adjacent faces of said upright members, means securing said guide blocks to said guide plates and said cutter bar, said cutter har being guided by said upright members through said guide plates and said guide blocks for vertical reciprocating movement along said upright members, a plurality of wedge yshaped teeth detachably secured in spaced relation along the upper edge of said cutter bar, the cutting edges of -said teeth being aligned in a 'straight line with respect to each other for cooperation with said rst named wedge shaped teeth, a table adjacent said cutter bar and movable therewith for supporting work to be cut, Va hydraulic ram mounted below said cutter bar and secured thereto for moving said cutter bar toward said header, power means mounted on said hand truck and connected to said ram foractuating said ram, and spring means extending between said cutter bar and said U-shaped frame for movingsaid cutter bar away from said header.

References `ACited-n the tile of lthis patent UNITED STATES PATENTS 2,523,601 Swift Sept. 26, 1950 2,613,661 Huber Oct. 14, 1952 2,657,681 Gatzke Nov. 3, 1953 2,723,657 Jones Nov, v1-5, 1955 

